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  Controlled solubilization of toluene by silicate-catanionic surfactant mesophases as studied by in situ and ex situ XRD

Lind, A., Andersson, J., Karlsson, S., Ågren, P., Bussian, P., Amenitsch, H., et al. (2002). Controlled solubilization of toluene by silicate-catanionic surfactant mesophases as studied by in situ and ex situ XRD. Langmuir, 18(4), 1380-1385. doi:10.1021/la011240a.

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Lind, A.1, Author
Andersson, J.1, Author
Karlsson, S.1, Author
Ågren, P.2, Author              
Bussian, P.2, Author              
Amenitsch, H.1, Author
Lindén, M.2, Author              
Affiliations:
1Abo Akad Univ, Dept Phys Chem, Porthansgatan 3-5, FIN-20500; Turku, Finland; Austrian Acad Sci, Inst Biophys & Xray Struct Res, A-8042 Graz, Austria, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: Mesoscopically ordered silicate-surfactant composite materials of the M41S type synthesized in the presence of a swollen agent have been characterized by in situ and ex situ X-ray diffraction analysis. The key feature of the room-temperature synthesis is the use of a mixture of cationic and anionic surfactants as structure-directing agents. The lower interfacial charge density of the mixed surfactant aggregates stabilizes structures of lower interfacial curvature and therefore facilitates a more controlled solubilization of organic swelling agents. An increased solubilization capacity of the catanionic surfactant-silicate mesophase was observed close to an anionic/cationic surfactant ratio corresponding to a transition to the lamellar phase in the absence of toluene. In the presence of toluene, the catanionic template stabilizes microemulsion droplets that serve as building blocks for the final material. However, a fair amount of organic compound is solubilized in the silica-catanionic surfactant composite after the mesophase is formed. Although the present communication concerns mesoporous silica, the concept is a general one and may allow the synthesis of non-siliceous large-pore materials.

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Language(s): eng - English
 Dates: 2002-02-19
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 20154
DOI: 10.1021/la011240a
ISI: 000174009300063
 Degree: -

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Title: Langmuir
  Alternative Title : Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 18 (4) Sequence Number: - Start / End Page: 1380 - 1385 Identifier: ISSN: 0743-7463